diff options
author | Eric Dumazet <edumazet@google.com> | 2017-08-08 08:41:58 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-13 02:31:22 (GMT) |
commit | 87fdcfe211956379d57092a6b7a4e669d318fc0b (patch) | |
tree | 3d8dacefade2f8d8730855504916965df71e2035 /net/core | |
parent | e392e305af01c4512a7d78b6ca47d9cf57f68d0d (diff) | |
download | linux-87fdcfe211956379d57092a6b7a4e669d318fc0b.tar.xz |
tcp: fastopen: tcp_connect() must refresh the route
[ Upstream commit 8ba60924710cde564a3905588b6219741d6356d0 ]
With new TCP_FASTOPEN_CONNECT socket option, there is a possibility
to call tcp_connect() while socket sk_dst_cache is either NULL
or invalid.
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4
+0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 setsockopt(4, SOL_TCP, TCP_FASTOPEN_CONNECT, [1], 4) = 0
+0 connect(4, ..., ...) = 0
<< sk->sk_dst_cache becomes obsolete, or even set to NULL >>
+1 sendto(4, ..., 1000, MSG_FASTOPEN, ..., ...) = 1000
We need to refresh the route otherwise bad things can happen,
especially when syzkaller is running on the host :/
Fixes: 19f6d3f3c8422 ("net/tcp-fastopen: Add new API support")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: Wei Wang <weiwan@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core')
0 files changed, 0 insertions, 0 deletions